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Contenido archivado el 2019-03-15

ENERGY CASCADING COMBINED WITH THERMAL ENERGY STORAGE IN INDUSTRY

Objetivo



A SURVEY CARRIED OUT IN THE USA INTO THE USE OF THERMAL ENERGY STORAGE AS A MEANS OF RECOVERING WASTE HEAT HAS INDICATED A FUTURE ENERGY SAVING POTENTIAL OF 10 EXP8 GJ PER ANNUM FOR 5 MAIN INDUSTRIAL SECTORS. IF SIMILAR SAVINGS COULD BE MADE WITHIN THE EEC, A POTENTIAL FINANCIAL SAVING OF APPROXIMATELY 240 X 10 EXP6 ECU PER ANNUM WOULD BE POSSIBLE. THE OBJECTIVE OF THIS STUDY IS TO EVALUATE HEAT STORAGE POTENTIAL FOR U.K. INDUSTRY.

USING TECHNICAL CONSTRAINTS BASED ON REQUIRED POWER DENSITIES (100 KW/M3) AND ECONOMIC CONSTRAINTS BASED ON ANNUAL CHARGE CYCLE FREQUENCIES (500 CYCLES PER YEAR), A DETAILED SURVEY OF A REPRESENTATIVE SAMPLE FRAME OF U.K. INDUSTRY HAS BEEN CARRIED OUT. IT WAS SHOWN THAT THE TECHNICAL AND ECONOMIC POTENTIAL REPRESENTS ABOUT 1 % OF THE TOTAL ENERGY USE IN THE MANUFACTURING SECTOR OF THE U.K. WHICH IS EQUIVALENT TO 3.9.10 EXP7 GJ PER ANNUM. THE HIGHEST PROBABILITY OF A SATISFACTORY CASCADE MATCH OCCURS IN THE TEMPERATURE RANGE BETWEEN 100 AND 250 DEGREES C AND ABOVE 1 000 DEGREES C.

THE LOWER OF THESE TEMPERATURE RANGES IS ASSOCIATED WITH STEAM STORAGE WHILE THE HIGHER RANGE IS AN AREA WHERE TRADITIONAL REGENERATORS HAVE BEEN USED. THESE ACCOUNT FOR 83 % AND 15 % OF THE POTENTIAL USE RESPECTIVELY. THE SURVEY HAS ALSO SHOWN THAT THERE IS A GAP IN THE DEVELOPMENT OF STORAGE TECHNOLOGY IN THE TEMPERATURE RANGE 250 - 500 DEGREES C WHICH MIGHT BE BEST FILLED BY THE DEVELOPMENT OF HIGH TEMPERATURE PHASE-CHANGE MATERIAL STORES.

STEAM ACCUMULATORS AND REGENERATORS APPEAR TO BE ABLE TO CONTRIBUTE MOST TO INDUSTRIAL ENERGY CONSERVATION IN INTERMITTENT PROCESSES. THE GREATEST POTENTIAL FOR STEAM STORAGE DOES NOT LIE IN ASSOCIATING IT WITH AN INDUSTRIAL PROCESS, BUT IN INTEGRATING IT INTO THE STEAM SERVICE SYSTEM. NEW STORAGE TECHNOLOGIES BASED ON PHASE-CHANGE AND THERMOCHEMICAL SYSTEMS ARE FAR LESS SIGNIFICANT. WHERE THERE IS AN OVERLAP BETWEEN NEW AND CONVENTIONAL STORAGE TECHNOLOGY, THE CONVENTIONAL HAS BEEN CHOSEN SINCE IT IS LIKELY TO BE CHEAPER. IN ADDITION, THERE WERE NO PROCESSES IN THE FEASIBLE RANGE FOR THERMOCHEMICAL STORAGE DUE TO THE CONSTRAINT IMPOSED BY THE TECHNICALLY ACHIEVABLE POWER DENSITY.

THE GREATEST BARRIERS TO THE IMPLEMENTATION OF THERMAL STORAGE ARE ECONOMIC; THE SYSTEMS HAVE EXCESSIVE PAYBACK PERIODS OR THE SYSTEMS REQUIRE EXCESSIVE CAPITAL OUTLAY WHICH WILL PREVENT OTHER CAPITAL PROJECTS FROM BEING IMPLEMENTED. THERE IS OFTEN ALSO A CONFLICT BETWEEN EXPENDITURE ON PRODUCTION EQUIPMENT AND EXPENDITURE ON SERVICES, SINCE MANY FIRMS WILL GIVE PREFERENCE TO PRODUCTION EQUIPMENT WHICH WILL GIVE A TANGIBLE RETURN.

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Coordinador

CRANFIELD UNIVERSITY
Aportación de la UE
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Dirección

MK43 0AL BEDFORD
Reino Unido

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